Josue Guerrero served as a Marine mortarman and saw combat in Iraq. After the "Commander in Chief Forum" showcasing Hillary Clinton and Donald Trump, Mr. Guerrero said he's still open to hearing from a third-party candidate. John Ismay/KPCC

Hillary Clinton and Donald Trump's appearance on a nationally televised forum on national security and veterans' issues Wednesday night left some military veterans in Los Angeles wishing they could hear more from third-party candidates.